Ring resonator-based surface emitting quantum cascade lasers

E. Mujagić, C. Schwarzer, M. Nobile, H. Detz, S. Ahn, P. Klang, A. M. Andrews, W. Schrenk, C. Deutsch, K. Unterrainer, J. Chen, Claire F. Gmachl, G. Strasser

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We describe the design, simulation, fabrication and operation of ring cavity surface emitting lasers (RCSEL) based on quantum cascade structures for the midinfrared (MIR) and terahertz (THz) spectral range. MIR RCSELs facilitate an enhancement of optical power and a reduction in threshold current density, as compared to Fabry-Perot (FP) lasers. In continuous wave operation the maximum temperature of ring based devices is 50 K higher than in FP emitters. Also in THz QCLs a twofold increase in radiation efficiency is observed when compared to FP lasers. The emitters exhibit a robust single-mode operation around 8 μm and 3.2 THz, with a side mode suppression ratio of 30 dB. The ring-shaped resonator forms symmetric far-field profiles, represented by a lobe separation of ∼1.5° and ∼15° for MIR and THz lasers, respectively.

Original languageEnglish (US)
Title of host publicationNovel In-Plane Semiconductor Lasers IX
StatePublished - 2010
EventNovel In-Plane Semiconductor Lasers IX - San Francisco, CA, United States
Duration: Jan 25 2010Jan 28 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherNovel In-Plane Semiconductor Lasers IX
Country/TerritoryUnited States
CitySan Francisco, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • Beam shaping
  • Far field
  • Mid-infrared
  • Quantum cascade laser
  • Ring cavity
  • Single mode
  • Terahertz


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